One issue with these lenses is quite different diameter of original focus ring (from 44.5 to 46mm on my lenses). So, all these gears have 44mm inner diameter, and should be machined up to actual diameter of your rings. If you able to give us exact diameder, we'll machine ID free of charge. Or you can do this locally on a lathe in some local metal workshop.

Our gears have industry standard 32 pitch (mod 0.8). They are placed over original focus gears and secured with three set screws (installed).

Inner diameter: 44mm

Outer diameter: 56.7mm

Thickness: 5mm

Weight: 11g

For sale is the 32 pitch gear only. All lenses are pictued for illustration only.

Question:

I have a set of these lenses and would like to use with follow focus. Being so small, compared to other lenses, can they be used with this ring in any regular follow focus command attached to rods? is there a specific type?